Electric coil construction



Patented Oct. 9, 1928.

, UNITED STATES PATENT OFFICE.

MARIUS LATOUR, OF PARIS, FRANCE, ASSIGNOR TO LATOUR CORPORATION, OF JERSEY 1 CITY, NEW JERsEY A CORPORATION OF DELAWARE.

ELECTRIC COIL CONSTRUCTION.

No Drawing. Application filed May 17, 1923, S eria1 No. 639,708, and in France June 14, 1922.

' quene'y currents. Now, the relative quantianneal the laminations of the alloy in questies that have been found to give good results, after exhaustive testing. are about as follows: 33.92% nickel and 1.15% manganese. The permeability of these alloys decreases notably with the temperature, so that one operates preferably at about a temperature of 100 degrees C. As a matter of fact,

it has been found in the case of the alloys in question, that an increase in temperature tends to greatly diminish the losses due to hysteresis. Moreover, these latter losses increased by the use of sheets of great thinness are reduced to a low value if care is taken to tion in vacuo. The resistivity is of an order of magnitude around 85 microhms per cubic centimeter.

Multiplier devices built with these alloys can naturally be used also for the purpose of multiplying the frequency of a current of less value than hereinbefore considered, as obtained, e. g, by a Poulsen or a mercuryarc.

In the co'pendi'ng application the proposition has been made to use in loading coils or Pupin coils fa similar alloy. This alloy, as a matter of gfa'ct, occasions but very small losses; but si reality the sheets thereof are annealed ,vacuo, the permeability in the initial inductions is by far greater than ,in ordinary ii bn. One would thus be led to use the ij'gaps'f githat have been provided even while using the same alloy.

Another application of this alloy would be to'einploy it in the construction of the magnetic circuit of high-frequency transformer'susedfi'n combination with amplifiers. In transformers ofthis sort it is, as a matter of fact "erydesirable to reduce the losses to a minimum, particularly so in resonance amplifiers. It may thus be of advantage to substitute-in these amplifier transformers this alloyfor iron itself the use of which has been proposfed in French Patent No. 512,295 of the present inventor.

Having described my invention, what I claim is:

A composition of matter forming the mag-'- MARIUS LATOUR. 

